A miniature tree door of unknown origin just showed up one day in San Francisco's Golden Gate Park, and has been captivating neighborhood residents ever since.

"When I see the door, I think of the word ‘delight,'" Richmond District Blog editor Sarah Bacon told ABC News. "When people talk about walking by it, it makes their day a little happier because it's unexpected."

It was Bacon's site that first brought news of the "elf door" to the world earlier this month.

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The story was subsequently picked up by other local news outlets, and residents soon started flocking to the park's concourse to see the tree for themselves.

And more: Park visitors have taken to stuffing the tree with notes detailing their hopes and dreams and love of cheesecake.